[Ocfs2-devel] [PATCH 2/3] ocfs2:freeze-thaw: initialization and cleanup

[Wengang Wang]

this patch does some initialization and cleanup for freeze/thaw.

Authored-by: Tiger Yang <tiger.yang at oracle.com>
Authored-by: Wengang Wang <wen.gang.wang at oracle.com>
Signed-off-by: Wengang Wang <wen.gang.wang at oracle.com>
---
 fs/ocfs2/dlm/dlmapi.h  |    1 +
 fs/ocfs2/dlm/dlmlock.c |   12 ++++++++++++
 fs/ocfs2/dlmglue.c     |   24 ++++++++++++++++++++++++
 fs/ocfs2/super.c       |   21 +++++++++++++++++++++
 4 files changed, 58 insertions(+), 0 deletions(-)

diff --git a/fs/ocfs2/dlm/dlmapi.h b/fs/ocfs2/dlm/dlmapi.h
index b5786a7..489c599 100644
--- a/fs/ocfs2/dlm/dlmapi.h
+++ b/fs/ocfs2/dlm/dlmapi.h
@@ -217,4 +217,5 @@ void dlm_register_eviction_cb(struct dlm_ctxt *dlm,
 			      struct dlm_eviction_cb *cb);
 void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb);
 
+int dlm_freeze_lock_supported(struct dlm_ctxt *dlm);
 #endif /* DLMAPI_H */
diff --git a/fs/ocfs2/dlm/dlmlock.c b/fs/ocfs2/dlm/dlmlock.c
index 437698e..ad15a66 100644
--- a/fs/ocfs2/dlm/dlmlock.c
+++ b/fs/ocfs2/dlm/dlmlock.c
@@ -764,3 +764,15 @@ error:
 	return status;
 }
 EXPORT_SYMBOL_GPL(dlmlock);
+
+int dlm_freeze_lock_supported(struct dlm_ctxt *dlm)
+{
+	if (dlm->dlm_locking_proto.pv_major == 1)
+		return (dlm->dlm_locking_proto.pv_minor >= 1);
+
+	if (dlm->dlm_locking_proto.pv_major > 1)
+		return 1;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dlm_freeze_lock_supported);
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 0caa69e..cf88af2 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -115,6 +115,8 @@ static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres,
 					    int new_level);
 static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres,
 					 int blocking);
+static int ocfs2_check_freeze_downconvert(struct ocfs2_lock_res *lockres,
+					  int new_level);
 
 #define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres)
 
@@ -290,6 +292,11 @@ static struct ocfs2_lock_res_ops ocfs2_refcount_block_lops = {
 	.flags		= 0,
 };
 
+static struct ocfs2_lock_res_ops ocfs2_freeze_lops = {
+	.check_downconvert = ocfs2_check_freeze_downconvert,
+	.flags		= 0,
+};
+
 static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres)
 {
 	return lockres->l_type == OCFS2_LOCK_TYPE_META ||
@@ -722,6 +729,15 @@ void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres,
 				   &ocfs2_refcount_block_lops, osb);
 }
 
+static void ocfs2_freeze_lock_res_init(struct ocfs2_lock_res *res,
+				       struct ocfs2_super *osb)
+{
+	ocfs2_lock_res_init_once(res);
+	ocfs2_build_lock_name(OCFS2_LOCK_TYPE_FREEZE, 0, 0, res->l_name);
+	ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_FREEZE,
+				   &ocfs2_freeze_lops, osb);
+}
+
 void ocfs2_lock_res_free(struct ocfs2_lock_res *res)
 {
 	mlog_entry_void();
@@ -3006,6 +3022,7 @@ local:
 	ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb);
 	ocfs2_nfs_sync_lock_res_init(&osb->osb_nfs_sync_lockres, osb);
 	ocfs2_orphan_scan_lock_res_init(&osb->osb_orphan_scan.os_lockres, osb);
+	ocfs2_freeze_lock_res_init(&osb->osb_freeze_lockres, osb);
 
 	osb->cconn = conn;
 
@@ -3043,6 +3060,7 @@ void ocfs2_dlm_shutdown(struct ocfs2_super *osb,
 	ocfs2_lock_res_free(&osb->osb_rename_lockres);
 	ocfs2_lock_res_free(&osb->osb_nfs_sync_lockres);
 	ocfs2_lock_res_free(&osb->osb_orphan_scan.os_lockres);
+	ocfs2_lock_res_free(&osb->osb_freeze_lockres);
 
 	ocfs2_cluster_disconnect(osb->cconn, hangup_pending);
 	osb->cconn = NULL;
@@ -3228,6 +3246,7 @@ static void ocfs2_drop_osb_locks(struct ocfs2_super *osb)
 	ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres);
 	ocfs2_simple_drop_lockres(osb, &osb->osb_nfs_sync_lockres);
 	ocfs2_simple_drop_lockres(osb, &osb->osb_orphan_scan.os_lockres);
+	ocfs2_simple_drop_lockres(osb, &osb->osb_freeze_lockres);
 }
 
 int ocfs2_drop_inode_locks(struct inode *inode)
@@ -3909,6 +3928,11 @@ void ocfs2_set_locking_protocol(void)
 	ocfs2_stack_glue_set_locking_protocol(&lproto);
 }
 
+static int ocfs2_check_freeze_downconvert(struct ocfs2_lock_res *lockres,
+					  int new_level)
+{
+	return 1; //change me
+}
 
 static void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
 				       struct ocfs2_lock_res *lockres)
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 14f47d2..9127760 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -134,6 +134,7 @@ static void ocfs2_destroy_inode(struct inode *inode);
 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
+static int ocfs2_freeze_lock_supported(struct ocfs2_super *osb);
 
 static const struct super_operations ocfs2_sops = {
 	.statfs		= ocfs2_statfs,
@@ -1772,10 +1773,18 @@ static int ocfs2_get_sector(struct super_block *sb,
 	return 0;
 }
 
+static int ocfs2_freeze_lock_supported(struct ocfs2_super *osb)
+{
+	if (!osb->cconn || !osb->cconn->cc_lockspace)
+		return 0;
+	return dlm_freeze_lock_supported(osb->cconn->cc_lockspace);
+}
+
 static int ocfs2_mount_volume(struct super_block *sb)
 {
 	int status = 0;
 	int unlock_super = 0;
+	int unlock_freeze = 0;
 	struct ocfs2_super *osb = OCFS2_SB(sb);
 
 	mlog_entry_void();
@@ -1796,6 +1805,15 @@ static int ocfs2_mount_volume(struct super_block *sb)
 	}
 	unlock_super = 1;
 
+	if (ocfs2_freeze_lock_supported(osb)) {
+		status = ocfs2_freeze_lock(osb, 0);
+		if (status < 0) {
+			mlog_errno(status);
+			goto leave;
+		}
+		unlock_freeze = 1;
+	}
+
 	/* This will load up the node map and add ourselves to it. */
 	status = ocfs2_find_slot(osb);
 	if (status < 0) {
@@ -1821,6 +1839,9 @@ static int ocfs2_mount_volume(struct super_block *sb)
 		mlog_errno(status);
 
 leave:
+	if (ocfs2_freeze_lock_supported(osb) && unlock_freeze)
+		ocfs2_freeze_unlock(osb, 0);
+
 	if (unlock_super)
 		ocfs2_super_unlock(osb, 1);
 
-- 
1.6.5.2